斯卡拉正則表達式的YouTube視頻ID

Question

我試圖使用提取自YouTube網址視頻ID如下：

val YoutubeRegex = """v=([^&]+)""".r 

    "v=IQJ13vFYOU8&feature=g-all-lik" match { 
    case YoutubeRegex(videoId) => videoId 
    case _ => throw new NoSuchFieldError("impossible to find youtube Id") 
    } 

Saddly這不工作...任何想法？非常感謝

Answer 1

是不是應該這樣？

val YoutubeRegex = """v=([^&]+).*""".r // need to specify that there could be remainder 

"v=IQJ13vFYOU8&feature=g-all-lik" match { 
    case YoutubeRegex(videoId) => videoId 
    case _ => throw new NoSuchFieldError("impossible to find youtube Id") 
} 

所以你會得到IQJ13vFYOU8部分，而不選擇。